Automatic elevator-gate.



Patented Oct. 7, |902.

E. T A .G TB H0 GT un ME nul.- E M .m ST .A IM 0 T u A N0. 7l0,60l.

(Application median. 14, 1902.)

2 Sheefts-Sheei L (No Model.)

. No. 7|o',so|. Patented out. 7, 1.902.' n. s. MGNAUGHT.

AUTOMAIC ELEVATOB GATE.

4 (Application led Jl.n14, 1902.) (No Model.) 2 Sheets-.'Sheet 2.

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NITED STATES PATENT OFFICE.

IRA S. MCNAUGHT, OF FORT WORTH, TEXAS, ASSIGNOR OF ONE-HALF TO O. M.GIBLER, OF FORT VORTH, TEXAS.

AUTOMATIC ELEVATOR-GATE.

SPECIFICATION forming part of Letters Patent NO. 710,601, dated October7, 1902.

Application tiled January 14, 1902. Serial No. 89,6 8B. (No model.)

To @ZZ whom it may concern,.- A lever F is pivoted to a cross-piece Fand Be it known that I, IRA S. lWIONAUGHT, acitidepends therefrom, thelower end of said zen of the United States, residing at Fort lever beingbifurcated and carryinga pulley Worth, in the county of Tarrant andState of G within the bifurcation. Upon the inner Texas, have invented anew and useful Auside of the leverF and in alinement with the 55 tomaticElevator-Gate, of which the following pulley G is an antifriction-rollerH, adapted is a specification. to travel in the grooved track E.

This invention is an automatic elevator A double pulley I is swiveledupon ascrewgate, the object of the invention being to prohook I',secured in one of the guide-posts B,

1o videasimple and efficient mechanism in conand a pulley K is alsoattached to the said 6o nection with the gate and elevator-carwhereguide-post adjacent to its upper end, and the by as the saidelevator-car ascends and depulleys K and K2 are arranged upon the topscends the gate will be automatically raised of the cross-piece K3,connecting the guideor lowered in such a manner that when the posts D.

elevator-car is at the landing the gate will be A rope L is connected tothe upper end of 65 raised, and lowered when the elevator passes thegate Gand passes over the pulleys K2, K', above or below the saidlanding. and K, down around the double pulley I and Another object ofthe invention is to propulley G, then again around the pulley I, andvide a mechanism of such construction that is finally fastened to thelower end of the zo the operation of the gate will be positive anddepending lever F. 7o

sure irrespective of the speed at which the A strap-loop F2 is attachedto the dependelevator-car is moved. ing lever F and extends over thecross-bar iVith these objects in view the invention F3, thereby holdingthe lever in its proper consists in the peculiar'construction of thevertical position during this vibration, and several parts and in theirnovel combination the stop F4 is arranged upon the cross-piece 75 orarrangement, all of which will be fullyde- F3 to limit the movement ofthe lever and scribed hereinafter and pointed out in the prevent itbeing thrown too far. claim. From the above description, taken in con-In the drawings forming part of this speci'- nection with theaccompanying drawings, it 3o ication,Figure 1 is a perspective viewilluswill be obvious that as the elevator-car is 8o trating myinvention, the elevator-car being raised or lowered theantifriction-roller carshown level with the landing and the gate riedupon the end of the lever will enter the being raised. Fig. 2 is asectional elevation, track and operate the lever, throwing it to a theelevator-car being below the landing or central position, as indicatedin Fig. l, and door and the gate closed. Fig. 3 is a detail in so doingthe ropeL is operated upon, caus- 85 section illustrating the pulleysand rope passing the gate to be raised. As the elevatoring thereover.car moves away from the landing the lever Referring to the drawings, Aindicates an will resume its normal position (shown in ordinaryelevator-car moving between the Fig. 2) and the gatewill again descend.By 4o upright guide-posts B, and Oindicates a verthe employment of agrooved track having 9o tically-movable gate sliding between theupflanges upon both sides the operation ot' the right guide-posts D. Agrooved track E, serlever is positive, and a much lighter weight pentinein form, is rigidly attached to the of gate can be employed, a gatesufficiently elevator A, said track being in the form of a heavy to takeup the slack in the rope, as the double compound curve, the 'upper andlower grooved track will positively move the lever 95 ends being invertical alinement and the and will also take away the strain from thecentral portion reaching substantially to the elevator-car proper in itsmovement up and center of the side of the elevator-car. The down betweenthe guide-posts B. By having upper and lower ends of the track E are thedouble pulley I swiveled it will always 5o slightly flared, as shown atE. be in direct line with the end of the lever, roo

and the Wear upon the pulley and the rope will therefore be reduced to aminimum.

I am aware that a straight and inclined track has been employed inconnection with the centrally-pivoted lever to which a pulleyrope hasbeen attached; but a single straight track used in connection With suchforni of lever is objectionable, for the reason that in case theelevator-car is moving rapidly the lever will scarcely have time toshift from one side of the track to the other, and damage is thereforeliable to occur. I am also aware that double-curved tracks have beenemployed for spreading two levers for operating pulley-ropes; but thisform of device is also objectionable, for the reason that a heavy gaiemust also be employed to hold the levers against the track, and the saidtracks would often have to be so large as to render them incapable ofuse in the average elevator-car.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

In an automatic elevator-gate, the combination with an elevator, ofvertically-sliding gate, a grooved serpentine track attached to theelevator-car, a depending lever having the antifriction-lever at itslower end, and

also a guide-pulley at said lower end, a double

